Responses
I might be mistaken but I'm fairly certain he doesn't know that she's a girl. I wouldn't necessarily say he fell in love with Xiao Man but he did think she looked super cute in the play (she did ♡). (I'm assuming you're talking about her roommate)
Yeah, the boy who threatened the other one to exchange rooms
I don't remember...the red haired boy discovered that Xiao Man is a girl or he fell in love thinking that she's a boy?